Well-boring drill.



C. E. REED.

WELL BORING DRILL. APPLICATION FILED DEC. 2. 1916.

Patented Aug. 14, 1917.

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WELL BORING DRILL.

APPLICATION FILED DEC. 2, 1916.

1,236,982 Patented 14, 191

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I l l 'llil Inventor.

Clare eldwardfl ed,

CLARENCE EDWARD REED, OF HOUSTON, TEXAS.

WELL-BORING DRILL.

Specification of Letters Patent.

Patented Aug. 14, 1917.

Application filed December 2, 1916. Serial No. 134,662.

To all whom it may concern:

Be it known that I, CLARENCE EDWARD REED, a citizen of the UnitedStates, and resident of Houston, Texas, have invented certain new anduseful Improvements in IVell-Boring Drills of which the following is aspecification.

This invention relates to rotary well boring drills of the type whichincludes a head, or carrier, adapted to be rapidly rotated,by powermechanism, about its vertical axis and a disk cutter mounted in thecarrier and adapted to rotate-therewith and also have an independentrotary movement about its own axis.

The object of the invention is to provide a device of the kind which isparticularly simple and durable in construction and which is highlyefiicient in operation, since it is well adapted for use in softformations, gumbo, soft shale or gypsum, as well as for use in cuttinghard rock strata.

The preferred exemplification of my invention is illustrated in theaccompanying drawings, wherein a Figure 1 is a side elevation .of thetool.

Fig. 2 is a sectional view at a quarter turn from Fig. 1.

Fig. 3 is a bottom plan view.

Fig. 4: is a faceview of a section of one of the cutting disks, and

Fig. 5 is a similar view of the companion cutting disk.

The head, or carrier, A, of the tool is preferably substantially of theconstruction disclosed in my Patent No. 1,159,087, granted November 2nd,1915, and the cutters B, C, are mounted in the head in a mannersubstantially corresponding to the way the cutters are illustrated insaid patent, so that the advancing portion of the cutter will projectbeyond the side of the head, or carrier, and the retreating portion ofthe cutter will be within the plane thereof. Each cutter is providedwith peripheral teeth preferably of inverted V shape in cross section,these teeth being helically disposed, or each extending at an angle to aradial plane intersecting the same or at an acute angle to the sidefaces of the cutter, and each tooth includes a minor beveled portion 1at the innen face of the cutter, or face of larger diameter, and a majorreversely beveled portion 2 extending from the high part of portion 1 tothe outer side of the cutter, or the side of smaller diameter.

Asshown herein, the angular, or helical, arrangement of the teeth of thecutter B is substantially the reverse of the corresponding arrangementof the teeth of the cutter C, so that in the operation of the tool theteeth of one cutter will cross the path of the companion cutter.

The outer, or knife, edge of the majorportion of each tooth is curved topresent an are substantially coextensive with the side wall of theopening cut by' -the tool which causes the lengthwise edge portions ofthe teeth to cut orrmill the material at the side of the hole incontra-distinction to scraping the material from the side of the hole bythe edge of the cutter of greatest diameter.

In the operation of the tool, as the cutter B rotates on its own axis,portions of each tooth are progressively brought into cutting. actionfrom the rear part of the major portion 2 toward the point of junctureof the latter with the portion 1, and as cutter C rotates theprogressive action is from the front of portion 2 toward the rear endthereof.

What I claim is 1. In a rotary drill for boring oil wells, and incombination, a head adapted to be rotated on its vertical axis and abeveled disk cutter mounted in the lower end of the head to turn on asubstantially horizontal axis which is offset from said vertical axis,the advancing portion of the cutter projecting beyond the outer side ofthe head and the retreating portion of the cutter being disposed withinthe plane of said side, the periphery of the cutter being provided withhelically disposed teeth, the outer lengthwise edges of which cut thematerial at the side of the hole during the rotation of the cuttinghead.

' 2. In'a rotary drill for boring oil wells and in combination, a headadapted to be rotated on its vertical axis and a disk cutter vmounted inthe lower portion thereof to turn on a horizontal axis offset from saidvertical axis, the advancing portion of the cutter projecting beyond theside of the head and the retreating portion thereof being located withinthe plane of said side, said cutter being provided with peripheral teethhelically disposed and each comprising a minor beveled portion and amajor differently beveled portion, the lengthwise outer edges of thelatter portion of each tooth cutting the material at the side of thehole during the drilling operation.

3. In a rotary boring drill of the class described and in combination ahead adapted to be rotated on its vertical axis and a cutter mounted inthe lower end thereof to turn on a horizontal axis and having itsadvancing portion projecting beyond the head and its retreating portiondisposed within the plane of the side wall of the head, said cutterbeing provided with peripheral teeth helically disposed, each toothcomprising a minor beveled portion and a major diiierently beveledportion, the outer edge of the last named portion presenting an arccoextensive with 'the side wall of the opening cut by the tool.

4:. In a rotary drill for boring oil wells and in combination, a headadapted to be rotated on a vertical axis and a disk cutter mounted inthe lower portion thereof to turn freely on a horizontal axis offsetfrom the vertical axis, said cutter having peripheral helically disposedteeth of inverted V- shape in cross section, and each tooth including aminor beveled portion disposed adjacent the inner face of the cutter anda major beveled portion extending from the high part to the first namedportion to the outer face of the cutter, the lengthwise outer marginaledge of the last named portion having a cutting action at the side ofthe hole during the boring operation.

5. A rotary oil-well boring drill of the class described comprising ahead adapted to be rotated on its vertical axis and a pair of beveledcutters mounted therein to rotate freely on horizontal axes, the facesof the cutters of larger diameter being opposed to each other and theaxis of one of the cutters being offset in a horizontal direction inrelation to the axis of the other cutter and said cutter bein providedwith peripheral beveled teeth he 'cally disposed, the helicalarrangement of one of the cutters being the reverse of that of the teethof the other cutter.

6. In a rotary drillfor boring oil wells and the like and incombination, a head adapted to be rotated on its vertical axis, abeveled cutter mounted in the lower portion of the head to turn on asubstantially horizontal axis offset from said vertical axis, the cutterbeing provided with equi-distantly .spaced peripheral teeth, each toothextending transversely at an acute angle to the side face of the cutterand comprising two portions differently beveled.

7. In a rotary boring drill of the class described and in combination, ahead adapted to be rotated on its vertical axis, a disk shaped beveledcutter mounted in the lower portion thereof to turn on a horizontal axisofiset from said vertical axis, said cutter having equi-distantly spacedperipheral teeth, the outer edge of the major portion of which eachconstitutes the are of a circle, whereby in the operation of the tooleach tooth will have different portions of said outer edge progressivelybrought into cutting operation.

8. In a rotary boring drill, and in combination, a head, a pair ofcutters mounted in the lower end thereof and oifset from each other in ahorizontal direction, each cutter having peripheral teeth extending atan angle to radial planes intersecting the same, the angular dispositionof the teeth of one cutter being difi'erent from that of the cornpanioncutter, and said teeth each comprising a minor beveled portion and amajor differently beveled portion, substantially as described.

9. In a rotary boring drill, and in combination, a head, companioncutters mounted in the lower end thereof, each having peripheral teethextending at an angle to radial planes intersecting the same, saidangular disposition of the teeth of one disk being in a directionreverse to that of the companion disk, and said teeth each comprising aminor and a major beveled portion, the minor beveled portions of theteeth being arranged nearer the vertical axis of the head than the majorbeveled portions.

10. In a rotary drill, in combination, a head adapted to be rotated onits vertical axis, a pair of cutters mounted in the lower end thereof torotate therewith and to turn independently thereof on axes offset fromeach other and from the vertical axis, each of said cutters beingprovided with substantially equi-distantly spaced peripheral teethextending at an acute angle to the side faces of the cutters, the outerlengthwise edges of the major portions of the teeth substantiallyconforming, in a plane intersecting the side of the hole,with thecurvature of such hole at said point of intersection.

In testimony whereof, I aflix my signature.

CLARENCE EDWARD REED.

